move rackunit's drracket plugin into its own pkg,

that you can now get via the (new) 'rackunit' pkg

original commit: ed5b2e6a4bfe2da46ecb67d33397d5b8e29e7169

pkgs/rackunit-pkgs/rackunit-plugin-lib/info.rkt

@@ -0,0 +1,13 @@
+#lang info
+
+(define collection 'multi)
+
+(define deps '("base"
+               "data-lib"
+               "rackunit-lib"
+               "gui-lib"
+               "drracket-plugin-lib"))
+
+(define pkg-desc "RackUnit testing framework DrRacket plugin")
+
+(define pkg-authors '(ryanc noel))

pkgs/rackunit-pkgs/rackunit/info.rkt

@@ -0,0 +1,12 @@
+#lang info
+
+(define collection 'multi)
+
+(define deps '("rackunit-lib"
+               "rackunit-plugin-lib"))
+(define implies '("rackunit-lib"
+                  "rackunit-plugin-lib"))
+
+(define pkg-desc "RackUnit testing framework")
+
+(define pkg-authors '(ryanc noel))